Go for the Arctic Cooling Freezer 7 pro, available for around $20 online, and $25 locally.
Small, cools as well as a $50 unit, and will allow you to overclock if you wish.
Quiet to boot, those others listed are gonna be buzzy.
If I desire to overclock in the future I'll buy a more expensive cooler. But for now I need to stick with a tight budget. Plus its 29.99 on newegg w/$5 shipping which isnt cheap for me.